is 2 2488253 - 1
has 749039 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L85DECD11D4DE409Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.941767.1642%2382500857701000.69658.1983%12.638269.8561%2.6920%
PrimeNet2590.030962.7119%100001800000.00192.5356%0.032863.6574%0.9455%
GPU722630.641465.0794%110001600000.00191.3808%0.643365.5615%0.4822%
Difference+4+11.3003+2.0848%+2371500+85610100+0.6946+6.8175%+11.9949+4.2946%+4.2946%

Known prime factors (2 factors, 163.9 bits, 0.00658685% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24882533895294291043476599855132478.36678273678179901252
22 × 3 × 5659 × 51197 × 22513877
2014-11-21511972251387729,7780.12820.2304
2488253559102852220558390158499832685.53111234847345116400747
33 × 7 × 25409 × 31477 × 74323211
2014-11-2131477743232114,966,9760.41020.7606

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
24882532177870148360865661000410071627843269726716129627950163.897
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.290%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.919%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.314%
2011-01-21T06:03:00Oscar Östlin950001947500---0.020--2.680%
2014-09-03T20:52:00Jocelyn LaroucheManual testing120795120795---0.012--1.053%
2014-11-21T01:38:00mikrMSI2382500857701001250163.8970.6970.3451.3938.198%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00bezaharv4_computers21259--0.031--
2022-03-10T05:53:01LordJuliusManual testing21260--0.062--
2009-01-14T22:44:00Sturle Sundegiovanni.ifi260261--0.062--
2012-06-10T14:43:00Sebastian HornbostelManual testing261262--0.123--
2013-01-14T11:53:00dbaughManual testing262263--0.395--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.102 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

New Calculation Method

Total ECM effort:1.102 GHz-days
Estimated T-Level:0.600
DigitsB1CompleteFacMiss
20110000.38767.903%
25500000.03596.562%
302500000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.102


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00bezaharv4_computers85DECD11D4DE409E0.173


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T09:19:21kkmrkkblmbrbkc4.xlarge94C459E12E708F__no
2017-11-06T10:51:45Oliver KruseGTX-0
389529429104347659985513
55910285222055839015849983
94C459E12E708F__no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 120795 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-10T05:53:01+00:00